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Master Netting and Similar Agreements—Repurchase, Reverse Repurchase, and Securities Borrowing Transactions - Securities Purchased Under Agreements To Resell And Collateral Pledged By Counterparties (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Securities Purchased under Agreements to Resell [Abstract]    
Gross amounts of recognized assets $ 453 $ 519
Gross amounts offset in the Balance Sheets 0 0
Net amounts of assets presented in the Balance Sheets 453 519
Offsetting securities sold under agreements to repurchase 0 0
Securities collateral (not recognized on FHN’s Balance Sheets) (450) (516)
Net amount $ 3 $ 3